Marker 文档缺失 about g HOT 8 CLOSED

import { Canvas } from "@antv/g";

const canvas = new Canvas({
  containerId: "root",
  width: 400,
  height: 400
});

const group = canvas.addGroup();
const circle = group.addShape("marker", {
  attrs: {
    x: 50,
    y: 100,
    r: 10,
    lineWidth: 2,
    stroke: "blue",
    fill: "red"
    symbol: "circle" // square, diamond, triangle, triangle-down,
  }
});

canvas.draw();